Tire-inflation valve.



Patented Mar. 11,1919.

J. WJPOTTER,

TIRE INFLATION VALVE.

APPLICATION FILED OCT- 3|. 1911. 1,297,239

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TIRE-INFLATION vALv n;

Specification ofI-etters Patent.

Patented Mar. 11,1919.

Application filed October 81, 191-7. .Sefial N 9. 199,503.

To all whom it may concern:

Be it knownthat 1', JOHN W. POTTER, a citizen of the United States, residing at Ardmore, in the county of Carter and State of Oklahoma, have invented new and useful Improvementsin TireInfiation Valves, of

- which the following is a specification. p

"This invention relates to valves employed for inflating pneumatic tires, and its ob ect is to provide an improved relief valve in connection therewith which automatically allows excess pressure in the tire to escape,

and also to provide an alarm which is sound? ed when the air pressure drops below a certain predetermined point, the device therefore serving as a' check or guard against over-inflation as well as under-inflation'of the tire; An alarm is also associated with w the relief valve, which is sounded when said valve opens.

The object stated is attained by means of a novel combination and arrangement Fi 2. o

fieferring specifically to the drawing, '10 denotes a'valve body having a longitudinal passage 11 one end of which contains the usual check 'valve 12 to prevent the air which is discharged into the tirefrom returning. This end of the valve body or casing {is also fitted with the usual removable cap 13. The other end of the passage is adapted to be connected to the usual valve stem on the inner tube of the tire, the wall of thepassa e being screw threaded for this purpose." s the passage 11 contains a check valve, the usual check valve in the valve stem is dispensed with.

- Intermediate its ends the valve casing 10 has two valve chambers 14 and 15, respec tively, located on opposite sides of the passage l1 and being in open communication therewith.

The ,chamber"14.- opens into the passage- 11 by the way of a s ort passageway-'16 in which latter is formed a seat 17 for a valve 18 which is held'seated by a spring 19 the tension of which may beregulated by a screw 20 threaded through the Wall of, the

chamber andbearing against the outer end of the spring the inner endof .the latter bearing against the valve.

The wall of the chamber '14 has an outlet signal device or alarm in the form of a whistle 22 which is sounded when there is an escape of air through the ort 21.

port 21 to which is connected an audible The valve 18 is held close "by the spring the passage 11 as the latter is connected to .the valve stem of the'tire tube. When the pressure in the inner tube exceeds the pressure exerted by the spring 19 against the .19 against the air pressure in the inner tube of the tire, sa1d pressure-being present in valve 8, said valve opens, and the excess o pressure escapes through the port 21 and the whistle 22, s'oundingthe latter and giving notice that the excess pressure is bein relieved. It will therefore be impossib e to accidentally over-inflate the tire. Any excess pressure developing in the tire from heat or other causes, is also automatically relieved. As soon as the normal pressure is restored, the valve 18 closes. The pressure to which the valve 18 is to respond isreadily regulated byadjustme'nt of the spring 19,

. the screw 20' being provided for this purpose; r

The .valve isalso provided with a low pressure alarm comprising a whistle 23 con-'- nected to a port 24 in the wall of the chamber- 15. This chamber is divided by a partition 25 into two sections 26 and 27, respectively,, the first mentioned section being Q1 connection with a passageway 28 leading from the passage 11. The port 24 opens into the section 27. The partition 25 has a ported seat 29for' a valve 30 which is held to its seat by the pressure in the passage 11.

This pressure is opposed by a spring 31 1 bearing against the valve, the tension of said spring being ad ustable by a screw 32 l threaded through the wall of the chamber section 27. o

It will be evident that when the pressure in the tire drops to a point where it can no longer hold'the valve 30 sea-ted against the tension of the spring 3l, the valve opens, allowing air to escape to the whistle 23 and sound the same. The operator is therefore notified that -the tire needs pumping up, and.

Cji

when tne normal pressure is again attainted the valve 30 close Opposite the valve 30, the Wall chamber is fitted with a screw plug 8e to permit the removal of the valve.

in erder that the valve 30 may he rendered inoperative While the is pumped up, the chamber 15 is provided with. a valve er, which latter when it is advanced across the chamber forms a barrier across the same and thus cuts off the valve 30 from the air which is being pumped into the ti e.

ll ithout this valve, the air would cont 1-- ually escape While the tire Was be1ng pumped up. After the tire is properly inflated, the valve 3% Will he opened, andthe valve 80 will now be held closed by the air pressure until the latter drops below "the pressure exerted by the spring 31 against saidvalve, whereupon it opens, with the result that the Whistle 23 is sounded.

3v the use of the v ve mechanisminheiore described the tire he heat 0 erly inflated at all tire-es the a ent fectually serves as a check or guardragainst a over-inflation as well as under-inflation.

I olaimt A tire inflation valve, comprising a loedy provided with a longitudinal passage having sageway opening into the aforesaid passage,

a partition in the valve chamber. dividing the same into two sections one of .Whiol communicates With the longitudinal passage through the aforesaid passageway, and the.

air escape port of said chamber leading from the other section thereof, a valve in said last naentionedsection, a spring engageable with said valve for opening the same, and a valve in the second-mentioned chamber adapted to out off the last-mentioned valve from the pressure in the chamber.

1 in testimony whereof I affii: my signature.

JGHN W. POTT;

n air inlet at one end and an air outlet at a 

